-
Ellis, D.; Wilson, T.; Allen, D.: Information science and information systems : conjunct subjects - disjunct disciplines (1999)
0.02
0.020071074 = product of:
0.04014215 = sum of:
0.04014215 = product of:
0.0802843 = sum of:
0.0802843 = weight(_text_:science in 4345) [ClassicSimilarity], result of:
0.0802843 = score(doc=4345,freq=8.0), product of:
0.13793045 = queryWeight, product of:
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.052363027 = queryNorm
0.5820636 = fieldWeight in 4345, product of:
2.828427 = tf(freq=8.0), with freq of:
8.0 = termFreq=8.0
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.078125 = fieldNorm(doc=4345)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Content
- Beitrag eines Themenheftes: The 50th Anniversary of the Journal of the American Society for Information Science. Pt.2: Paradigms, models, and models of information science
- Source
- Journal of the American Society for Information Science. 50(1999) no.12, S.1095-1107
-
Ellis, D.: ¬A behavioral model for information retrieval system design (1989)
0.02
0.01605686 = product of:
0.03211372 = sum of:
0.03211372 = product of:
0.06422744 = sum of:
0.06422744 = weight(_text_:science in 2707) [ClassicSimilarity], result of:
0.06422744 = score(doc=2707,freq=2.0), product of:
0.13793045 = queryWeight, product of:
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.052363027 = queryNorm
0.4656509 = fieldWeight in 2707, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.125 = fieldNorm(doc=2707)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of information science. 15(1989) no.4, S.237-247
-
Ellis, D.: Theory and explanation in information retrieval research (1984)
0.02
0.01605686 = product of:
0.03211372 = sum of:
0.03211372 = product of:
0.06422744 = sum of:
0.06422744 = weight(_text_:science in 5337) [ClassicSimilarity], result of:
0.06422744 = score(doc=5337,freq=2.0), product of:
0.13793045 = queryWeight, product of:
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.052363027 = queryNorm
0.4656509 = fieldWeight in 5337, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.125 = fieldNorm(doc=5337)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of information science. 8(1984), S.25-38
-
Ellis, D.: Paradigms in information retrieval research (1994)
0.02
0.01605686 = product of:
0.03211372 = sum of:
0.03211372 = product of:
0.06422744 = sum of:
0.06422744 = weight(_text_:science in 1261) [ClassicSimilarity], result of:
0.06422744 = score(doc=1261,freq=2.0), product of:
0.13793045 = queryWeight, product of:
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.052363027 = queryNorm
0.4656509 = fieldWeight in 1261, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.125 = fieldNorm(doc=1261)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Encyclopedia of library and information science. Vol.54, [=Suppl.17]
-
Ellis, D.: Progress and problems in information retrieval (1996)
0.01
0.014188935 = product of:
0.02837787 = sum of:
0.02837787 = product of:
0.05675574 = sum of:
0.05675574 = weight(_text_:22 in 789) [ClassicSimilarity], result of:
0.05675574 = score(doc=789,freq=2.0), product of:
0.1833664 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.052363027 = queryNorm
0.30952093 = fieldWeight in 789, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0625 = fieldNorm(doc=789)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Date
- 26. 7.2002 20:22:46
-
Ellis, D.; Oldman, H.: ¬The English literature researcher in the age of the Internet (2005)
0.01
0.014049753 = product of:
0.028099505 = sum of:
0.028099505 = product of:
0.05619901 = sum of:
0.05619901 = weight(_text_:science in 4657) [ClassicSimilarity], result of:
0.05619901 = score(doc=4657,freq=2.0), product of:
0.13793045 = queryWeight, product of:
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.052363027 = queryNorm
0.40744454 = fieldWeight in 4657, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.109375 = fieldNorm(doc=4657)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of information science. 31(2005) no.1, S.29-
-
Foster, A.E.; Ellis, D.: Serendipity and its study (2014)
0.01
0.0070961965 = product of:
0.014192393 = sum of:
0.014192393 = product of:
0.028384786 = sum of:
0.028384786 = weight(_text_:science in 1794) [ClassicSimilarity], result of:
0.028384786 = score(doc=1794,freq=4.0), product of:
0.13793045 = queryWeight, product of:
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.052363027 = queryNorm
0.20579056 = fieldWeight in 1794, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.0390625 = fieldNorm(doc=1794)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- Purpose - The purpose of this paper is to explore the concept of serendipity and approaches to its study particularly in relation to information studies. Design/methodology/approach - The origins of the term serendipity are described and its elaboration as an exploratory and explanatory concept in science and the social sciences are outlined. The distinction between serendipity and serendipity pattern is explained and theoretical and empirical studies of both serendipity and the serendipity patterns are explored. The relationship between information encountering is described. Empirical studies of serendipity using Citation Classics and other research approaches in information studies are described. Findings - The discrepancy between occurrences of serendipity in studies using Citation Classics and reported serendipity in philosophy of science, research anecdotes, information encountering and information seeking by inter-disciplinary researchers is highlighted. A comparison between a process model of serendipity and serendipity as an emergent behavioural characteristic are indicates directions for future research. Originality/value - The paper provides and original synthesis of the theoretical and empirical literature on serendipity with particular reference to work in information studies and an indication of the methodological difficulties involved in its study.
-
Wilson, T.D.; Ford, N.; Ellis, D.; Foster, A.; Spink, A.: Information seeking and mediated searching : Part 2: uncertainty and Its correlates (2002)
0.01
0.006021322 = product of:
0.012042644 = sum of:
0.012042644 = product of:
0.024085289 = sum of:
0.024085289 = weight(_text_:science in 5232) [ClassicSimilarity], result of:
0.024085289 = score(doc=5232,freq=2.0), product of:
0.13793045 = queryWeight, product of:
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.052363027 = queryNorm
0.17461908 = fieldWeight in 5232, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.046875 = fieldNorm(doc=5232)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 53(2002) no.9, S.704-715
-
Ellis, D.; Wilson, T.D.; Ford, N.; Foster, A.; Lam, H.M.; Burton, R.; Spink, A.: Information seeking and mediated searching : Part 5: user-intermediary interaction (2002)
0.01
0.006021322 = product of:
0.012042644 = sum of:
0.012042644 = product of:
0.024085289 = sum of:
0.024085289 = weight(_text_:science in 5233) [ClassicSimilarity], result of:
0.024085289 = score(doc=5233,freq=2.0), product of:
0.13793045 = queryWeight, product of:
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.052363027 = queryNorm
0.17461908 = fieldWeight in 5233, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.046875 = fieldNorm(doc=5233)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 53(2002) no.11, S.883-892
-
Ford, N.; Wilson, T.D.; Foster, A.; Ellis, D.; Spink, A.: Information seeking and mediated searching : Part 4: cognitive styles in information seeking (2002)
0.01
0.006021322 = product of:
0.012042644 = sum of:
0.012042644 = product of:
0.024085289 = sum of:
0.024085289 = weight(_text_:science in 5239) [ClassicSimilarity], result of:
0.024085289 = score(doc=5239,freq=2.0), product of:
0.13793045 = queryWeight, product of:
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.052363027 = queryNorm
0.17461908 = fieldWeight in 5239, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.046875 = fieldNorm(doc=5239)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 53(2002) no.9, S.728-735
-
Spink, A.; Wilson, T.D.; Ford, N.; Foster, A.; Ellis, D.: Information seeking and mediated searching : Part 1: theoretical framework and research design (2002)
0.01
0.006021322 = product of:
0.012042644 = sum of:
0.012042644 = product of:
0.024085289 = sum of:
0.024085289 = weight(_text_:science in 5240) [ClassicSimilarity], result of:
0.024085289 = score(doc=5240,freq=2.0), product of:
0.13793045 = queryWeight, product of:
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.052363027 = queryNorm
0.17461908 = fieldWeight in 5240, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.046875 = fieldNorm(doc=5240)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 53(2002) no.9, S.695-703
-
Ellis, D.: ¬The dilemma of measurement in information retrieval research (1996)
0.01
0.0050177686 = product of:
0.010035537 = sum of:
0.010035537 = product of:
0.020071074 = sum of:
0.020071074 = weight(_text_:science in 3003) [ClassicSimilarity], result of:
0.020071074 = score(doc=3003,freq=2.0), product of:
0.13793045 = queryWeight, product of:
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.052363027 = queryNorm
0.1455159 = fieldWeight in 3003, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.0390625 = fieldNorm(doc=3003)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science. 47(1996) no.1, S.23-36
-
Ellis, D.; Furner, J.; Willett, P.: On the creation of hypertext links in full-text documents : measurement of retrieval effectiveness (1996)
0.01
0.0050177686 = product of:
0.010035537 = sum of:
0.010035537 = product of:
0.020071074 = sum of:
0.020071074 = weight(_text_:science in 4214) [ClassicSimilarity], result of:
0.020071074 = score(doc=4214,freq=2.0), product of:
0.13793045 = queryWeight, product of:
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.052363027 = queryNorm
0.1455159 = fieldWeight in 4214, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.0390625 = fieldNorm(doc=4214)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science. 47(1996) no.4, S.287-300
-
Spink, A.; Wilson, T.D.; Ford, N.; Foster, A.; Ellis, D.: Information seeking and mediated searching : Part 3: successive searching (2002)
0.01
0.0050177686 = product of:
0.010035537 = sum of:
0.010035537 = product of:
0.020071074 = sum of:
0.020071074 = weight(_text_:science in 5242) [ClassicSimilarity], result of:
0.020071074 = score(doc=5242,freq=2.0), product of:
0.13793045 = queryWeight, product of:
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.052363027 = queryNorm
0.1455159 = fieldWeight in 5242, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.0390625 = fieldNorm(doc=5242)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Source
- Journal of the American Society for Information Science and Technology. 53(2002) no.9, S.716-727
-
Spink, A.; Wilson, T.; Ellis, D.; Ford, N.: Modeling users' successive searches in digital environments : a National Science Foundation/British Library funded study (1998)
0.00
0.0049673375 = product of:
0.009934675 = sum of:
0.009934675 = product of:
0.01986935 = sum of:
0.01986935 = weight(_text_:science in 1255) [ClassicSimilarity], result of:
0.01986935 = score(doc=1255,freq=4.0), product of:
0.13793045 = queryWeight, product of:
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.052363027 = queryNorm
0.1440534 = fieldWeight in 1255, product of:
2.0 = tf(freq=4.0), with freq of:
4.0 = termFreq=4.0
2.6341193 = idf(docFreq=8627, maxDocs=44218)
0.02734375 = fieldNorm(doc=1255)
0.5 = coord(1/2)
0.5 = coord(1/2)
- Abstract
- As digital libraries become a major source of information for many people, we need to know more about how people seek and retrieve information in digital environments. Quite commonly, users with a problem-at-hand and associated question-in-mind repeatedly search a literature for answers, and seek information in stages over extended periods from a variety of digital information resources. The process of repeatedly searching over time in relation to a specific, but possibly an evolving information problem (including changes or shifts in a variety of variables), is called the successive search phenomenon. The study outlined in this paper is currently investigating this new and little explored line of inquiry for information retrieval, Web searching, and digital libraries. The purpose of the research project is to investigate the nature, manifestations, and behavior of successive searching by users in digital environments, and to derive criteria for use in the design of information retrieval interfaces and systems supporting successive searching behavior. This study includes two related projects. The first project is based in the School of Library and Information Sciences at the University of North Texas and is funded by a National Science Foundation POWRE Grant <http://www.nsf.gov/cgi-bin/show?award=9753277>. The second project is based at the Department of Information Studies at the University of Sheffield (UK) and is funded by a grant from the British Library <http://www.shef. ac.uk/~is/research/imrg/uncerty.html> Research and Innovation Center. The broad objectives of each project are to examine the nature and extent of successive search episodes in digital environments by real users over time. The specific aim of the current project is twofold: * To characterize progressive changes and shifts that occur in: user situational context; user information problem; uncertainty reduction; user cognitive styles; cognitive and affective states of the user, and consequently in their queries; and * To characterize related changes over time in the type and use of information resources and search strategies particularly related to given capabilities of IR systems, and IR search engines, and examine changes in users' relevance judgments and criteria, and characterize their differences. The study is an observational, longitudinal data collection in the U.S. and U.K. Three questionnaires are used to collect data: reference, client post search and searcher post search questionnaires. Each successive search episode with a search intermediary for textual materials on the DIALOG Information Service is audiotaped and search transaction logs are recorded. Quantitative analysis includes statistical analysis using Likert scale data from the questionnaires and log-linear analysis of sequential data. Qualitative methods include: content analysis, structuring taxonomies; and diagrams to describe shifts and transitions within and between each search episode. Outcomes of the study are the development of appropriate model(s) for IR interactions in successive search episodes and the derivation of a set of design criteria for interfaces and systems supporting successive searching.
